Lead pencil



July 21, 1925,

D. ZAKIM LEAD PENCIL Filed Nov. 8. 1922 anveutoz:

Patented July 21, 1925.

UNITED STATES PATENT OFFICE.

DAVID ZAKIM, OF NEW YORK, N. Y., ASSIGNOR TO STERLING METAL NOVELTY MFG(70., INQ, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

LEAD PENGIL.

Application filed November 8, 1922. Serial No. 599,615.

To all whom it may concern: Be it known that I, DAVID ZAKIM, a citizenof Poland, and a resident of Bronx, in the county of Bronmcity and Stateof New York, have invented certain new and useful Improvements in LeadPencils, of which the following is a specification.

The invention relates to improvements in mechanical lead pencils of theclutch and propeller types, andit resides in the novel features ofconstruction and relative arrangement of parts hereinafter described,and particularly pointed out in the claims.

The invention pertains particularly to the construction at the back endof the pencil,

this construction embodying a hollow or tubularplug member adapted tofit within and rotatably engage the outer end of the exterior barrel ofthe pencil and to receive in its outer end a rubber eraser and at itsinner end to fixedly receive the outer or rear end of the lead-holdingtube of the pencil. In the clutch type of pencil, the clutch tube may beopen at both ends, in accordance with my invention, and the stick oflead may be inserted into said tube from either end, the outer end ofthe tube being exposed through said tubular plug member when the eraseris removed from said member and being closed by said eraser when theeraser is restored to position. In the propeller type of pencil, thelead-holding tube is gripped by the tubular plug member of myinvention,the same as isthe clutch tube of a clutch pencil, but in viewof the presence of the propeller rod within the lead-holding tube ofapropeller pencil, the lead must always be inserted at the tip end ofthe pencil. My invention involves a novel hollow or tubular plug memberto cooperate with the outer end of the barrel of the pencil and to gripat its inner end the lead-holdingtube and receive at its outer end arubber eraser, said tubular member being screw-threaded into the barrelof the 1 pencil when thepcncil' is of clutch-type, and

rotatable within the end of the barrel of a 7 pencil of propeller typeand notnormally removabletherefrom.

The invention will be fully understood from the detailed descriptionhereinafter presented, reference being had to the accompanying drawings,in which: i

Fig. 1 is a centrallongitudinal section through a lead pencil of clutchtype embodying the features of my invention;

Fig. 2 is a detached side elevation of the tubular plugmember of myinvention shown as holding at its inner end the outer end portion of theclutch-tube and having in its outer end a rubber eraser;

Fig. 3 is a side elevation of the pencil illustrated in section in Fig.1;

Fig. 4 is a vertical transverse section of the clutch-pencil, taken onthe dotted line 4L4EOfFig.1; v a

Fig. 5 is a vertical'transverse section of the clutch-pencil, taken onthe dotted line 55 of Fig.1;

Fig. 6 is a central longitudinal section through a pencil of propellertype embodying my invention, and

Fig. 7 is a view showing the tubular member of my invention, the leadholding tube and the rubber eraser detached from the pencil shown inFig. 6, Fig. 7 being partly in section.

In the drawings, referring to Figs. 1 to 5, inclusive, showing a clutchtype of lead penoil, 10 designates the outer metallic barrel of thepencil, 11 the lead-holding clutchtube, 12 the tubular outer end plugmember by said member 12, and 1 1 an ordinary pocket clip of knowncharacter applied to the barrel 10.

The forward portions of the barrel 10 and lead holding clutch tube 11are of usual type,

and hence require no special description, said portions being adapted tohold the stick of lead 15 in the customary manner.

The tubular plug member 12 is preferably in one integral piece of sheetmetal and has a plain contracted inner end 16, an adjoin ing spirallythreaded section 17, aplain sec Ition 18 and an annularly ribbed section19 forming internal annular grooves 20 to a d of the section 17 of themember 12 is a;

pressed up thread and this thread is adapted to cooperate with aninwardly pressed spirally deflected lug '21 extending inwardly from theouter end portion of the ..barrel 10, said lug 21 takingthe of myinvention, 13 a rubber eraser carried place of a screwthread and leavingthe outer surface of the barrel 1O perfectly smooth with the exceptionof the depression to form the lug 21. The tubular member 12 may bescrewed into and out from the outer end of the barrel by reason of thepresence of the threaded section 17 on said member and the provision ofthe lug 21 in the barrel 10.

The forward end of the tubular member 12 has driven into it the rear endof the leadholding tube 11, and said end of the tube 11 fits so tightlywithin the member 12, especially within the plain section 16 thereof,that no other means is required for securing the two parts together. Thelead-holding tube 11 is a split tube, the split being indicated in Fig.2 at the reference numeral 22, and as shown in Fig. 1 the outer end ofthis tube 11 is driven into the tubular member 12 to a considerableextent, said end of the tube 11 being extended from the forward endofthe tubular member 12 to about the outer edge of the threaded section 17thereof. The plain section 16 of the tubular member 12 is contractedtothe dimensions of and grips the tube 11 throughout a considerableextent thereof and not only is in very firm engagement with the outersurfaces of the tube 11, but cooperates with the other portions of themember 12 in preventing tilting action of the tube 11 within the barrel10. The drive fit of the tube into themember 12 renders a separation ofthe tube 11 from the member 12 substantially impossible without the useof special tools.

In Figs. 6 and 7 I illustrate my invention as applied to a pencil of thepropeller type, and therein 25 designates the exterior barrel of thepencil, 26 the lead holding tube, 27 the propeller rod in said tube, 28a spiral guide for the lug 29 on the propeller rod, 30 the stick of leadand 31 the tubular outer end plug member of my invention, all of theparts just mentioned wit-h the exception of the tubular outer end plugmember 31, being of known character and disclosed in Letters Patent ofthe United States No. 1,431,510, granted to me October 10, 1922.

The outer end tubular member 31 has a forward plain section 32 intowhich the lead holding tube 26 is firmly driven, an adjoining outwardlyswelled section 33 which closely but rotatably fits within the outer endportion of the barrel 25, an inwardly pressed annular groove 34, anadjoining tubular section 35 which closely fits within the outer end ofthe barrel 25 and beyond said section 35, an outer end portion which isexposed beyond the barrel 25 and comprises an annular outwardly pressedbead 36, a plain tubular section 37, an outwardly pressed annular head38 and a plain tubular section 39. A rubber eraser 40 fits tightlywithin the outer portion of the tubular member 31 and extends inwardlybeyond the heading 38 and into the plain section 37. The bead 36 forms astop-shoulder and en gages the outer end of the barrel 25 and also addsto the finish of the tubular member 31. The annular groove 34 cooperateswith a lug 41 pressed inwardly from the barrel 25 after the tubularmember 31 has been inserted into the outer end thereof and entering theannular groove 34 of said member 31 for cooperation therewith. The lug41 and groove 34 lock the tubular me1nber 31 in position within theouter end of the barrel 25 and at the same time permits,

said member 31 to be rotated within the outer end of the barrel for thepurpose of effecting the longitudinal movement of the propeller rod 27.The spiral guide 28 is rigid with the barrel 25, and hence when eitherthe member 31 or the barrel 25 is rotated, the propeller rod 27 is givenlongitudinal movement outwardly or inwardly according to the directionof rotation of the barrel 2-5 or member 31. The lead holding tube 26 isrigid within the plain section 32 of the tubular plug member 31 and iscarried by said member, and hence has no rotary movement except with themember 31. Ordinarily the barrel 25 will be held in the left hand andthe tubular plug member 31 rotated by means of the thumb and finger ofthe right hand in moving forwardly or retracting rearwardly thepropeller rod. 7

My invention therefore pertains more particularly to the tubular outerend plug member of the pencil, said member entering the outer end of thebarrel of the pencil and being rotatable therein and at its inner endei'iioiently holding the outer end portion of the lead-holding tube andat its outer end receiving and exposing a rubber eraser and affordinggripping surfaces by which the said tubular plug member may be rotatedeither on being screwed into or from the barrel of the pencil, as in theclutch type of pencil, or on a fixed line, as in the propeller type ofpencil.

My invention is not limited to all the precise details of form andconstruction hereinbefore described, since I am aware that some thereofmay be changed or modified without departure from the spirit of myinvention and within the scope of the appended claims.

hat I claim as my invention and desire to secure by Letters Patent, is

1. A mechanical lead pencil of the character described con'iprising anexterior sheet metal barrel portion, an interior sheet metallongitudinal leadholding tube, a sheet metal tubular plug member fittingWithin and rotatably connected with the outer end of said barrelportion: and projecting outwardlv beyond the same, and a removable plugfitted into the outer end of said tubular plug member and closing andexposed beyond the same, the outer end portion of said lead-holding tubebeing rigidly within the inner end portion of said tubular plug memberand said tube being open at its outer end and adapted at said end, onthe removal of the removable plug, to receive the stick of lead.

2. A mechanical lead pencil of the character described comprising anexterior sheet metal barrel portion, an interior sheet metallongitudinal lead-holding tube, a sheet metal tubular plug memberfitting within and rotatably connected with the outer end of said barrelportion and projecting outwardly beyond the same, and a removable plugfitted into the outer end of said tubular plug member and closing andexposed beyond the same, the outer end portion of said lead-holding tubebeing rigidly within the inner end portion of said tubular plug member,and said tubular plug member being at its inner end portion contractedto the dimensions of the lead-holding tube to tightly grip the same andoutwardly beyond said contracted portion having a spiral thread pressedtherein, and said barrel in its outer end portion having a lug pressedinwardly therefrom to cooperate with said spiral thread.

Signed at New York city, in the county of New York and State of New Yorkthis 3lstsday of October, A. D., 1922.

DAVID ZAKIM.

